| http://www.w3.org/ns/prov#value | - Yet another embodiment of the present invention is a system for determining whether a target computer is on a network, the system comprising: (1) a first set of port identifiers stored in a computer-readable medium, each of the first set of port identifiers representing a port used by computers to receive data packets compliant with a first protocol of the network, each of the first set of port id
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